Mozilla Firefox/Firefox ESR/Thunderbird XSLT Parameter use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.9$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird. It has been classified as critical. Affected by this issue is some unknown functionality of the component XSLT Parameter Handler. Performing a manipulation results in use after free. This vulnerability was named CVE-2022-26485. The attack may be initiated remotely. In addition, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (unknown version). This affects an unknown code block of the component XSLT Parameter Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented 03/07/2022 as mfsa2022-09. It is possible to read the advisory at mozilla.org. This vulnerability is uniquely identified as CVE-2022-26485. It demands that the victim is doing some kind of user interaction. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/09/2026).

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 03/07/2022 with a due date of 03/21/2022:

Apply updates per vendor instructions.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the databases at Zero-Day.cz (688) and EUVD (EUVD-2022-31043). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 8.8
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Zero-Day.cz: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mozilla.org

Timelineinfo

03/04/2022 🔍
03/07/2022 +3 days 🔍
03/07/2022 +0 days 🔍
05/09/2026 +1524 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: mfsa2022-09
Status: Confirmed

CVE: CVE-2022-26485 (🔍)
GCVE (CVE): GCVE-0-2022-26485
GCVE (VulDB): GCVE-100-194283
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/07/2022 13:34
Updated: 05/09/2026 17:46
Changes: 03/07/2022 13:34 (40), 03/09/2022 12:49 (1), 04/24/2024 05:45 (23), 06/22/2024 15:11 (2), 09/19/2024 18:13 (1), 01/29/2025 02:04 (22), 05/01/2025 16:48 (3), 05/09/2026 17:46 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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