CVE-2025-31126
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedElement X iOS is a Matrix iOS Client provided by Element. In Element X iOS version between 1.6.13 and 25.03.7, the entity in control of the element.json well-known file is able, under certain conditions, to get access to the media encryption keys used for an Element Call call. This vulnerability is fixed in 25.03.8.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceElement X iOS fails to properly isolate the element.json well-known file processing from Element Call media encryption key handling. An entity controlling the well-known file (e.g., a compromised or malicious homeserver) can under certain conditions intercept or access the encryption keys used to secure Element Call voice/video calls, enabling potential call interception.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Element X iOS app versionOpen Element X iOS app, tap on your profile icon, scroll down and tap Settings, then tap About. Note the version number displayed next to the app name.Affected if Version is lower than 25.03.8 (e.g., 25.03.7, 25.02.x, earlier versions)
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Verify if element.json well-known file is configuredContact your homeserver administrator to confirm whether the homeserver serves a .well-known/matrix/client file (element.json) at the well-known endpoint.Affected if Your homeserver serves an element.json well-known file (this file tells the app where to find Element Call)
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Check if Element Call integration is enabledIn Element X iOS, go to Settings > Preferences > Voice and video. Look for options related to Element Call or third-party video bridges.Affected if Element Call or third-party VoIP/video calling integration is enabled and used for calls
You are affected if you use Element X iOS with version below 25.03.8, your homeserver serves the element.json well-known file, and you use Element Call for voice/video calls.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Element X iOS to version 25.03.8 or later. Additionally, ensure your homeserver is trusted and properly secured, as the well-known file is served by the homeserver.
25.03.8 or later
- Upgrade Element X iOS to version 25.03.8 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-31126 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-31126 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data