Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

Skip to content
cve.new Create a CVE report
Check your stack
CVE-2026-113867critical9.1

Stanza injection in XMPP chat

Impact

Thunderbird's XMPP chat feature is vulnerable to stanza injection, allowing a remote user to send crafted requests and inject arbitrary stanzas. This affects Thunderbird versions prior to 153.5.1 and 158.0.1. The vulnerability could be used to send messages or change settings on behalf of the user.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.
Applies when

This bug only affects Thunderbird's chat feature with XMPP accounts.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Mozilla · mozilla

Thunderbird

2 ranges
mozilla version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

153.5.1 → through 153.*

rpm versions

158.0.1 → through *

rpm versions

unknown

Other versions: unknown

Original source description

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-113867

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-116 ↗

CWE-116 Improper Encoding or Escaping of Output

CISA-ADP

Related →
Contributing organizations · 2
mozilla

Assigning organization

2026-10-20
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

3 sources
bugzilla.mozilla.org/show_bug.cgi
Source referencemozilla
www.mozilla.org/security/advisories/mfsa2026-114/
Security advisorymozilla
www.mozilla.org/security/advisories/mfsa2026-115/
Security advisorymozilla