CVE-2026-2775Disclosure(mozilla / firefox)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Mitigation bypass in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

Weakness type (CWE)

CWE-288

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

firefox
thunderbird

Threat summary

Patch or workaround signal is available
4 mentions across 3 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 4 signals
Disclosure: 3 classified signals
Peaked 2d ago at 2 mentions (2026-02-25); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

Disclosure

375.0%

Patch

125.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-02-25	2	Disclosure2
2026-03-01	1	Disclosure1
2026-04-16	1	Patch1

Full discourse4 posts

Giuseppe Paternicola@giuseppe_1337175d
Patch
🚨 CRITICAL: CVE-2026-2775 (CVSS 9.8) - Mitigation bypass in Firefox/Thunderbird DOM HTML Parser. Network exploitable, no user interaction required. Patch NOW to Firefox 148, ESR 115.33/140.8, Thunderbird 148/140.8. #CVE #PatchNow #ThreatIntel https://t.co/Q6O3qnE4ph
Post summary
A critical vulnerability (CVE-2026-2775) with a CVSS score of 9.8 affecting the Firefox/Thunderbird DOM HTML Parser is network-exploitable; immediate patching to the specified releases is advised.
0000053
25 followersView on X
CRAC Learning - Tech@cracbot221d
Disclosure
CVE-2026-2775 (CVSS:9.8, CRITICAL) is Modified. Mitigation bypass in the DOM: HTML Parser component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Fir..https://nvd.nist.gov/vuln/detail/CVE-2026-2775 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post announces CVE-2026-2775, a critical DOM mitigation bypass affecting older Firefox versions, providing its CVSS score and affected releases.
0000031
173 followersView on X
Infoflowcloud@infoflowcloud225d
Disclosure
🚨*CVE* CVE-2026-2775 Mitigation bypass in the DOM: HTML Parser component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2775 ----- Traducción: Evasión de mitigación en el DOM: componente de… http://infoflow.cloud`
Post summary
The post announces CVE-2026-2775, a mitigation bypass in Firefox’s HTML parser affecting versions below 148 and ESR versions below 115.33 and 140.8, and provides a link to the CVE record.
0000046
54 followersView on X
CVE@CVEnew225d
Disclosure
CVE-2026-2775 Mitigation bypass in the DOM: HTML Parser component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2775
Post summary
The text outlines a mitigation bypass vulnerability in Firefox’s HTML parser affecting versions below 148 and certain ESR releases, but it does not provide any PoC, exploit, or patch information.
00000216
56.6K followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-
App	mozilla	firefox	-	-	-
App	mozilla	thunderbird	-	-	-
App	mozilla	thunderbird	-	-	-

Explore more

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What researchers are saying

CVE-2026-2775

Giuseppe Paternicola[verified]@giuseppe_1337Patch

A critical vulnerability (CVE-2026-2775) with a CVSS score of 9.8 affecting the Firefox/Thunderbird DOM HTML Parser is network-exploitable; immediate patching to the specified releases is advised.

CRAC Learning - Tech@cracbotDisclosure

The post announces CVE-2026-2775, a critical DOM mitigation bypass affecting older Firefox versions, providing its CVSS score and affected releases.

Infoflowcloud@infoflowcloudDisclosure

The post announces CVE-2026-2775, a mitigation bypass in Firefox’s HTML parser affecting versions below 148 and ESR versions below 115.33 and 140.8, and provides a link to the CVE record.

CVE@CVEnewDisclosure

The text outlines a mitigation bypass vulnerability in Firefox’s HTML parser affecting versions below 148 and certain ESR releases, but it does not provide any PoC, exploit, or patch information.