VulnerabilityPublished 27 Oct 2026

CVE-2026-118178: A remote RSS feed could use the itunes:new-feed-url or newLocation element to permanently change its

Source GCVE Database

Authoritative record:CVE-2026-118178· High

Not known to be exploited · fixed in 153.6 : patch Thunderbird soon.

Data as of 27 Oct 2026, 22:13 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in 153.6

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-6j4v-p75m-p9wm

What to do

AI-suggested

This vulnerability has been fixed in Thunderbird versions 159 and 153.6. Users should update to these versions or later to mitigate the risk. No additional mitigation steps are required once the update is applied.

Description

A vulnerability in Thunderbird allows a remote RSS feed to use the itunes:new-feed-url or newLocation element to permanently change its stored subscription URL to a local file URL. This causes Thunderbird to read local files on every feed update. On Windows, this can also cause Thunderbird to connect to an attacker-controlled network share, potentially leaking the user's NTLM credentials. The issue affects all platforms for local file reads, but the NTLM credential leak is specific to Windows. This vulnerability was fixed in Thunderbird versions 159 and 153.6.

Impact

The vulnerability allows remote attackers to cause Thunderbird to read arbitrary local files, potentially exposing sensitive information. On Windows, it additionally enables connection to attacker-controlled SMB network shares, which can leak NTLM authentication credentials. This credential leak could facilitate offline password cracking or relay attacks. The local file read affects all operating systems running Thunderbird, but the NTLM credential leak is limited to Windows platforms.

References

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