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Information Disclosure Injection in Microsoft Teams for Android

IdentifiersCVE-2026-42835CWE-74· Improper Neutralization of Special…

CVE-2026-42835 is an improper neutralization of special elements in output used by a downstream component (CWE-74) in Microsoft Teams for Android. According to the provided advisory content, the flaw affects the Android Teams client and can be exploited by an authorized attacker over the network. Microsoft describes the issue as an injection vulnerability that can result in information disclosure, including the ability to read small portions of heap memory. The exposed memory may contain sensitive runtime data such as authentication tokens, session data, or cached credentials. The available context does not identify the specific vulnerable function or code path.

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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 authenticated low-privileged attacker to disclose information remotely from Microsoft Teams for Android. Based on the provided content, the primary impact is exposure of small portions of heap memory, which may include sensitive runtime artifacts such as authentication tokens, session data, or cached credentials. This creates a high confidentiality impact and could enable follow-on compromise of user sessions or access to protected resources if exposed secrets are reusable. The supplied facts also indicate Microsoft assessed high availability impact and no integrity impact.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting use of vulnerable Microsoft Teams for Android clients for sensitive communications until the fixed version is deployed, enforcing rapid mobile application update policies through enterprise mobility management where available, and restricting access to sensitive resources from unmanaged or outdated Android devices. No vendor-specific workaround beyond updating was provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply the Microsoft security update/fixed release for Microsoft Teams for Android associated with the June 2026 advisory cycle. The provided content states that Microsoft released the fix through the Google Play Store and advised users and enterprise administrators to update immediately via the official Google Play listing.
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
Microsoft CorporationTeamsapplication

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

ACTIVITY FEED

Recent activity

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

8 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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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 activity7

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-42835
NVD
nvd.nist.gov/vuln/detail/CVE-2026-42835
MITRE CWE · CWE-74
Improper Neutralization of Special Elements in…
msrc.microsoft.com
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42835