Loading story…
CISA added Langflow vulnerabilities to its Known Exploited Vulnerabilities catalog after evidence of active attacks, ordering U.S. federal agencies to remediate CVE-2026-55255 by July 10. The flaw is an insecure direct object reference in /api/v1/responses that lets an authenticated attacker use a victim flow UUID to access another user's flow, exposing sensitive data and consuming the victim's resources. Reporting also tied Langflow to broader KEV updates, including CVE-2025-3248, a missing-authentication flaw in /api/v1/validate/code that allows unauthenticated remote code execution and was updated in CISA's catalog to show known ransomware use.
Sysdig said it observed in-the-wild exploitation of CVE-2026-55255 on June 25, alongside repeated abuse of CVE-2026-33017, an unauthenticated Langflow RCE that attackers appeared to prefer because it is easier to operationalize and provides direct host compromise. The observed operator enumerated flows through /api/v1/flows/, then abused POST /api/v1/responses with prompts such as "leak api keys" to trigger another tenant's flow and attempt credential theft, while also deploying a malicious Langflow component that fetched a second-stage shell script from 45.207.216.55:8084. Researchers assessed the activity as automated, opportunistic, and financially motivated, combining credential theft, compute abuse, implant delivery, and botnet-style monetization.
Mallory correlates global threat intelligence with your attack surface — know if you’re exposed before adversaries strike.
6 events from the most recent confirmed update back to the earliest known activity.
After adding the vulnerabilities to KEV, CISA directed federal civilian executive branch agencies to remediate them by 2026-07-10. BleepingComputer also reported that agencies were ordered to prioritize patching the actively exploited Langflow flaw by Friday.
Langflow addressed CVE-2026-55255 in Langflow 1.9.2 and langflow-base 0.4.0. The fix remediates the IDOR issue in the /api/v1/responses endpoint that allowed cross-tenant flow execution and credential theft.
CISA added CVE-2026-55255, CVE-2026-48282, CVE-2026-48908, and CVE-2026-56290 to its Known Exploited Vulnerabilities catalog after evidence of active exploitation. The newly listed issues affect Langflow, Adobe ColdFusion, JoomShaper SP Page Builder, and Joomlack Page Builder.
On 2026-07-07, CISA's Known Exploited Vulnerabilities catalog was updated so that Langflow CVE-2025-3248 changed from unknown to known ransomware campaign use. The flaw is a missing authentication issue in the /api/v1/validate/code endpoint that can allow remote unauthenticated code execution.
During the observed activity, the same operator enumerated flow UUIDs via /api/v1/flows/ and abused POST /api/v1/responses with the prompt "leak api keys" to execute another tenant's flow via CVE-2026-55255. In parallel, the operator repeatedly exploited Langflow CVE-2026-33017 to inject a malicious component that fetched a second-stage shell script from 45.207.216.55:8084.
On 2026-06-25, Sysdig Threat Research Team documented the first known exploitation of Langflow CVE-2026-55255 in the wild. The activity targeted an exposed Langflow instance and was assessed as opportunistic and financially motivated.
Vulnerabilities, threat actors, malware, products, organizations, and breaches Mallory has linked to this story.
13 references tracked. Mallory keeps watching after this page renders.
threataft.com
Open sourcescworld.com
Open sourcemalware.news
Open sourcecyber.gc.ca
Open sourcegithub.com
Open sourcecisa.gov
Open sourceadvisories.gitlab.com
Open sourcesysdig.com
Open sourceMap indicators from this story to your assets and identify affected systems in minutes.
Every observed campaign, victim, and pivot linked to actors named in this story.
Malware, exploits, and IOCs connected to the activity described here.
YARA, Sigma, and Snort rules deployed to your SIEM as soon as they’re published.
Get matching new stories delivered to your team as they break — not the next morning.
Ask questions about this story and take action on the answers.
Other stories Mallory is tracking that overlap on entities, sources, or topic labels.
Threat actors rapidly exploited **CVE-2026-33017**, a critical unauthenticated remote code execution flaw in Langflow’s public flow build endpoint, allowing arbitrary Python code to reach an unsandboxed `exec()` path with a single crafted request. The bug affects Langflow versions prior to **1.9.0** and stems from the `POST /api/v1/build_public_tmp/{flow_id}/flow` endpoint accepting attacker-controlled flow data through an optional parameter. Researchers and vendor advisories said the issue is distinct from **CVE-2025-3248** because the vulnerable endpoint is intentionally public, meaning the fix required removing attacker-supplied flow data from that execution path rather than simply adding authentication. Sysdig and other researchers reported exploitation beginning within about **20 hours** of disclosure, with attackers scanning for exposed instances, validating code execution, reading files such as `.env`, `.db`, and `/etc/passwd`, stealing credentials, API keys, and database secrets, and attempting follow-on payload delivery from infrastructure including `173.212.205[.]251:8443`. The severity prompted **CISA** to add the flaw to its **Known Exploited Vulnerabilities** catalog and order federal agencies to remediate by **April 8, 2026** or discontinue use if they could not secure affected systems. Security guidance across the reports urged organizations to upgrade to **Langflow 1.9.0 or later**, restrict or remove internet exposure of the vulnerable endpoint, monitor outbound connections, and rotate secrets if compromise is suspected.
Jul 2, 2026
Attackers are actively exploiting **CVE-2026-5027**, a high-severity path traversal vulnerability in the open-source AI application platform **Langflow**, to write files to arbitrary locations on target systems and potentially achieve remote code execution. The flaw affects the `POST /api/v2/files` endpoint, where the `filename` parameter is not properly sanitized, and exploitation is made more severe by Langflow's default unauthenticated auto-login behavior, which lets attackers obtain a valid session token with a single unauthenticated request. VulnCheck reported observed attacks writing apparent test files to victim hosts, while Tenable identified the issue and assigned it a **CVSS 8.8** score. Internet exposure increases the risk: Censys data indicates about **7,000** Langflow instances are reachable online, with the largest concentration in North America. The exploitation report also fits a broader pattern of sustained attacker interest in Langflow, with other vulnerabilities including **`CVE-2026-0770`**, **`CVE-2026-21445`**, **`CVE-2026-33017`**, and **`CVE-2025-34291`** also reported as exploited in 2026; the last has been linked in public reporting to the Iranian state-backed group **MuddyWater**. Separately, a newly disclosed flaw in **Roxy-WI** (**`CVE-2026-45556`**) shows a similar arbitrary file-write-to-RCE pattern on managed load balancers, but no public patch was available at publication.
Jun 29, 2026
Multiple vulnerabilities in **Langflow** have exposed AI application deployments to both account-to-account abuse and active compromise. **`CVE-2026-33760`** affects versions before **1.9.0** and allows authenticated users to read, modify, rename, or delete other users’ messages, sessions, build artifacts, and LLM transaction logs through seven `/api/v1/monitor` endpoints that fail to enforce ownership checks. A separate flaw, **`CVE-2026-55255`**, affects versions before **1.9.2** and lets an authenticated attacker execute another user’s flow through the `/api/v1/responses` endpoint by supplying a victim `flow_id`, giving the issue a critical **CVSS 9.9** rating. At the same time, defenders are tracking a cryptocurrency-mining campaign exploiting **`CVE-2026-33017`**, an unauthenticated remote code execution bug in Langflow, to compromise exposed instances and deploy Monero miners. Threat research says the malware disables security controls, installs persistence, and can enable lateral movement through reused SSH keys; observed infrastructure includes **`83.142.209.214`** and **`94.156.64.241`**. Organizations running Langflow are being urged to upgrade to **1.9.0** and **1.9.2** or later as applicable, verify access-control enforcement, restrict public exposure of Langflow services, and treat signs of miner activity or unauthorized flow execution as a significant incident.
Jun 30, 2026