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CVE-2022-26485

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 …

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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.
CVSS 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.4/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.8: +1.32
  • Fresh EPSS: 14.26%: +0.07

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 8 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

blog.google
Press · 27 Jul 2023, 07:00 · The Ups and Downs of 0-days: A Year in Review of 0-days Exploited In-the-Wild in 2022 - blog.google
The Hacker News
Press · 01 Dec 2022, 08:00 · Google Accuses Spanish Spyware Vendor of Exploiting Chrome, Firefox, & Windows Zero-Days - The Hacker News
BleepingComputer
Press · 30 Nov 2022, 08:00 · Google discovers Windows exploit framework used to deploy spyware - BleepingComputer
blog.google
Press · 30 Nov 2022, 08:00 · New details on commercial spyware vendor Variston - blog.google
How-To Geek
Press · 07 Mar 2022, 08:00 · Firefox 97 Is Under Attack, Update Now to Protect Yourself - How-To Geek
See all 8 source documents
Tech Times
Press · 06 Mar 2022, 08:00 · Mozilla Firefox New Update FIXES Two Actively Exploited Bugs - Tech Times
BleepingComputer
Press · 06 Mar 2022, 08:00 · Mozilla Firefox 97.0.2 fixes two actively exploited zero-day bugs - BleepingComputer
gHacks
Press · 05 Mar 2022, 08:00 · Firefox 97.0.2 and Firefox ESR 91.6.1 are out with critical security fixes - gHacks

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.4 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.8; EPSS 14.3%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:37.150188+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
05 Mar 2022, 08:00
Added to the CISA KEV catalog
07 Mar 2022, 00:00
Published
22 Dec 2022, 00:00
Latest press mention
27 Jul 2023, 07:00
Score calculated
05 Nov 2026, 13:58