CVE-2025-27606

Session access via failed PIN logout cleanup

Published Mar 14, 2025 · Updated Mar 14, 2025

PIN lockout bypass in Element HQ Element Android 1.6.32 and earlier allows physically proximate attackers to keep guessing a user's PIN. After the failed-attempt limit, PinFragment requests credential clearing, but MainActivity treats a homeserver logout error as fatal and skips local cleanup. Physical possession of the device and a logout server error leave the Matrix session available for repeated PIN attempts and eventual access to its messages.

CVSS severity5.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PIN lockout bypass in Element HQ Element Android 1.6.32 and earlier allows physically proximate attackers to keep guessing a user's PIN. After the failed-attempt limit, PinFragment requests credential clearing, but MainActivity treats a homeserver logout error as fatal and skips local cleanup. Physical possession of the device and a logout server error leave the Matrix session available for repeated PIN attempts and eventual access to its messages.

The record

CVE
CVE-2025-27606
Published
Mar 14, 2025
Updated
Mar 14, 2025
Vendor
Element HQ
Product
Element Android
Classifications
CWE-488, T1110.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.6.34

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Element HQ · Element Androidversion=< 1.6.34

Published CVSS scores

5.1GitHub Maintainer Security AdvisoryCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-488Exposure of Data Element to Wrong Session
T1110.001Password Guessing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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