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  4. CVE 2026 104476 backdrop cms before 1351 information disclosure
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Back to active CVEs
High · CVSS 8.2CVE-2026-104476

Backdrop CMS before 1.35.1 Information Disclosure via Configuration Export Archive

Answer in brief

CVE-2026-104476 records a High severity (CVSS 8.2) vulnerability in Backdrop CMS before 1.35.1 Information Disclosure via Configuration Export Archive. The current sources do not mark it as known exploited. The current feed maps backdrop/backdrop (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 3, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps backdrop/backdrop (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
backdrop/backdropgeneric>=0 <1.35.11.35.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for backdrop/backdrop.
  2. 2Review the reported fix. Update backdrop/backdrop to 1.35.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • Source referencebackdropcms.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Backdrop CMS before 1.35.1 contains an information disclosure vulnerability that allows unauthenticated attackers to retrieve configuration export archives left on the server after transfer. Attackers can download compressed archives generated by users with configuration export permission to obtain the full site configuration, including sensitive settings.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Kener 4.0.0 before 4.1.6 Hidden Monitor Data Disclosure via Dashboard APIAlso CWE-200
  • CodeArt Google MP3 Audio Player 1.0.11 Arbitrary File Read via direct_download.phpSame generic ecosystem
  • Weaver e-Bridge Unauthenticated Arbitrary File Read via saveYZJFileSame generic ecosystem
  • H3C CVM Unauthenticated File Upload via fileUpload/upload TokenSame generic ecosystem
  • @orpc/json-schema: Prototype injection in smart coercionSame generic ecosystem
  • @orpc/zod: Prototype injection in smart coercionSame generic ecosystem

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200
Source
CVE List V5
Source checked
Oct 3, 2026
References
4 linked sources
Open source record