CVE-2026-113867Critical· 9.1▾ MidnightThunderbird 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 i…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.1 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
0.2% → 0.4%
— → 9.1
none → critical
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.
ThunderbirdRefer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-113868Medium· 5.3Uninitialized memory disclosure and out-of-bounds read in POP3 and SMTP NTLM authentication
CVE-2026-113866Medium· 5.9Account password sent unencrypted during Exchange account setup
CVE-2026-113869Medium· 5.4Use-after-free in S/MIME decryption during a security device password prompt
CVE-2026-118178NoneRSS feed could redirect its subscription to a local file or network share
CVE-2026-118175NoneContent of other messages could be included when replying to a crafted message
CVE-2026-118174NoneDisplaying a message could load an attacker-chosen URL through an OpenPGP key attachment