CVE-2022-26485 (GCVE-0-2022-26485)

Vulnerability from cvelistv5 – Published: 2022-12-22 00:00 – Updated: 2025-10-21 23:15
VLAI CISA Previdian
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-28 21:32 UTC
CWE
  • Use-after-free in XSLT parameter processing
  • CWE-416 - Use After Free
Assigner
mozilla CNA under the mitre root
CNA scorecard E 38/100 over 679 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Mozilla Firefox Affected: unspecified , < 97.0.2 (custom)
guessed Create a notification for this product.
Mozilla Firefox ESR Affected: unspecified , < 91.6.1 (custom)
guessed Create a notification for this product.
Mozilla Firefox for Android Affected: unspecified , < 97.3.0 (custom)
guessed Create a notification for this product.
Mozilla Thunderbird Affected: unspecified , < 91.6.2 (custom)
guessed Create a notification for this product.
Mozilla Focus Affected: unspecified , < 97.3.0 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fdedadc9-f50f-4bab-9aa7-b03bf2589fc7

Vulnerability ID: CVE-2022-26485

Status: Confirmed

Status Updated: 2022-03-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-07
Asserted: 2022-03-07
Scope
Notes: Mozilla Firefox Use-After-Free Vulnerability | Affected: Mozilla / Firefox | Description: Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-03-21 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2022-26485
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product Firefox
Due Date 2022-03-21
Date Added 2022-03-07
Vendorproject Mozilla
Vulnerabilityname Mozilla Firefox Use-After-Free Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-11-04 13:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e6eef2b7-cb40-4f8e-9b75-5780cc59782f

Vulnerability ID: CVE-2022-26485

Status: Confirmed

Status Updated: 2022-03-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-07
Asserted: 2022-03-07
Scope
Notes: KEVIntel entry: 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... | Affected: Mozilla / Firefox, Firefox ESR, Firefox for Android, Thunderbird, Focus | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Mozilla
Product Firefox, Firefox ESR, Firefox for Android, Thunderbird, Focus
Added Date 2022-03-07T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Firefox ESR",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "91.6.1",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Firefox for Android",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "97.3.0",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Thunderbird",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "91.6.2",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Focus",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "97.3.0",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "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 \u003c 97.0.2, Firefox ESR \u003c 91.6.1, Firefox for Android \u003c 97.3.0, Thunderbird \u003c 91.6.2, and Focus \u003c 97.3.0."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "Use-after-free in XSLT parameter processing",
                  "lang": "en",
                  "type": "text"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2022-12-22T00:00:00.000Z",
            "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
            "shortName": "mozilla"
          },
          "references": [
            {
              "url": "https://www.mozilla.org/security/advisories/mfsa2022-09/"
            },
            {
              "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1758062"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "assignerShortName": "mozilla",
        "cveId": "CVE-2022-26485",
        "datePublished": "2022-12-22T00:00:00.000Z",
        "dateReserved": "2022-03-04T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:15:29.432Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.