Unrated

Authentication Bypass in Cap-go OTP Verification

IdentifiersCVE-2026-56073CWE-288

CVE-2026-56073 is an authentication bypass vulnerability affecting Cap-go versions prior to 12.128.2. The flaw is in the OTP-based email verification workflow. According to the provided content, an attacker can intercept OTP verification requests and manipulate HTTP responses so that verification is falsely treated as successful. This allows the attacker to bypass the intended email verification control during the OTP verification process. The issue indicates insufficient server-side enforcement or trust in client- or transit-modifiable verification state during the authentication/verification flow.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker to bypass email verification in the OTP workflow. The provided content states this can enable unauthorized activation of two-factor authentication and can ultimately result in account takeover. The vulnerability is described as remotely exploitable and critically severe.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by hardening server-side OTP verification and auditing the email verification flow to ensure no client-controlled or interceptable response state can determine success. Review and restrict any logic that trusts modified HTTP responses for verification outcomes. Monitor for anomalous 2FA enablement events and suspicious account changes until the fixed version can be deployed.

Remediation

Patch, then assume compromise.

Upgrade Cap-go to version 12.128.2 or later. Apply the vendor security patch for this issue. Based on the provided content, remediation should also include correcting the OTP verification workflow so verification success is determined exclusively by trusted server-side validation, and reviewing response-handling logic to ensure manipulated HTTP responses cannot cause the application to mark verification as successful.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Cap-goCap-Goapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app

cvefeed high severityNews

Jun 19, 2026

CVE-2026-56073 - Cap-go - OTP Bypass via Response Manipulation in Email Verification

An authentication bypass vulnerability in Cap-go's OTP/email verification flow that allows attackers to manipulate server responses and falsely complete verification, potentially leading to unauthorized 2FA enablement and account takeover.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-56073

NVD

nvd.nist.gov/vuln/detail/CVE-2026-56073

MITRE CWE · CWE-288

cwe.mitre.org