CVE-2025-59161Network attack vector

Temporary room substitution via unvalidated predecessor links

Published Sep 16, 2025 · Updated Sep 16, 2025

Improper input validation in Element Web before 1.11.112 allows remote attackers to temporarily substitute an unrelated room in the room list. RoomListStore and leaveRoomBehaviour trusted a room's claimed predecessor when building upgrade history instead of requiring a verified relationship. A crafted predecessor link can hide the legitimate room and cause it to be left with the malicious room, but refreshing restores the correct list.

CVSS severityUnavailable
Unscored
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Element Web before 1.11.112 allows remote attackers to temporarily substitute an unrelated room in the room list. RoomListStore and leaveRoomBehaviour trusted a room's claimed predecessor when building upgrade history instead of requiring a verified relationship. A crafted predecessor link can hide the legitimate room and cause it to be left with the malicious room, but refreshing restores the correct list.

The record

CVE
CVE-2025-59161
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
Element HQ
Product
Element Web
Classifications
CWE-20, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=< 1.11.112

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Element HQ · Element Webversion=< 1.11.112

Published CVSS scores

2.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565.002Transmitted Data Manipulation

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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