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Information Disclosure in Microsoft Teams for Android
CVE-2026-42835 is a CWE-74 improper-neutralization injection vulnerability in Microsoft Teams for Android. An authorized, low-privileged attacker can send crafted Teams content over the network to trigger processing by a downstream component and expose small portions of the application heap. No victim interaction is required. Affected releases are Teams for Android versions before the vendor-fixed build released in the June 2026 security update cycle.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation enables remote disclosure of heap-resident data. Exposed memory may include authentication tokens, session identifiers, cached credentials, message fragments, or meeting metadata. Microsoft assigned CVSS v3.1 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H), indicating high confidentiality and availability impact with no integrity impact.
If you can’t patch tonight, do this now.
No vendor workaround is available beyond updating the application. Until updates are deployed, restrict the population of potential authenticated attackers by reviewing guest accounts and external collaboration settings, and enforce mobile application-version compliance through MDM controls.
Patch, then assume compromise.
Update Microsoft Teams for Android to the vendor-fixed release distributed through the Google Play Store. Enterprise administrators should use Intune or another MDM platform to require the fixed minimum application version across managed and BYOD Android devices.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.