CVE-2022-26485

Exp

Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.

Published: 2022-12-22 Last update: 2025-11-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-26485 is rated Critical Active Threat (87/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.85%). CISA KEV confirms active exploitation (added 2022-03-07) affecting Mozilla / Firefox. a weakness (CWE-416) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2022-26485

Name: Mozilla Firefox Use-After-Free Vulnerability · CISA KEV detail

Exploit added: 2022-03-07

Action due: 2022-03-21

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2022-26485

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-26485

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 6.28% 2.85% -3.43%
2 2026-05-28 7.37% 6.28% -1.09%
3 2026-05-22 — 7.37% —

Full EPSS history (64 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-26485

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2022-26485

OS Trackers for CVE-2022-26485

vendor priority summary link
alpine — CVE-2022-26485: 4 source package rows (firefox, firefox-esr, librewolf, thunderbird); 112 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 35, open 77. https://security.alpinelinux.org/vuln/CVE-2022-26485
debian not yet assigned CVE-2022-26485 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11. https://security-tracker.debian.org/tracker/CVE-2022-26485
gentoo high CVE-2022-26485: 2 GLSA(s) (202208-08, 202208-14), 4 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-26485
redhat critical — https://access.redhat.com/security/cve/CVE-2022-26485
suse high CVE-2022-26485 severity important: SUSE including 36 source package names (MozillaFirefox-140.2.0-160000.1.2, MozillaFirefox-91.6.1-112.92.1, …), 252 product×package rows across 85 product lines (Container suse/kiosk/firefox-esr, HPE Helion OpenStack 8, … (85 product lines)): Fixed 252. https://www.suse.com/security/cve/CVE-2022-26485/
ubuntu high CVE-2022-26485 high priority: Ubuntu including 1 source packages (firefox), 7 status rows across 7 suites (bionic, focal, impish, jammy, kinetic, lunar, upstream): released 7. https://ubuntu.com/security/CVE-2022-26485

Affected software / configurations for CVE-2022-26485

Vendor Product Version Raw CPE
mozilla firefox < 91.6.1 cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
mozilla firefox < 97.0.2 cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
mozilla firefox < 97.3.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:*
mozilla firefox_focus < 97.3.0 cpe:2.3:a:mozilla:firefox_focus:*:*:*:*:*:*:*:*
mozilla thunderbird < 91.6.2 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2022-26485

cvelogic Threat Intelligence