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Back to active CVEs
Medium · CVSS 4.3CVE-2026-57447

Discourse Doc Categories: Doc category index refresh leaks private topic titlesCVE-2026-57447

Answer in brief

CVE-2026-57447 records a Medium severity (CVSS 4.3) vulnerability in Discourse Doc Categories: Doc category index refresh leaks private topic titles. The current sources do not mark it as known exploited. The current feed maps discourse/discourse-doc-categories (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 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.3. 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 discourse/discourse-doc-categories (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
discourse/discourse-doc-categoriesgeneric<b15d4de02ad29d7c9525346afee51fef4a2c605ab15d4de02ad29d7c9525346afee51fef4a2c605a

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for discourse/discourse-doc-categories.
  2. 2Review the reported fix. Update discourse/discourse-doc-categories to b15d4de02ad29d7c9525346afee51fef4a2c605a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

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

  2. Source modified

    Oct 16, 2026

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

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Discourse Doc Categories is a plugin for organizing Discourse topics as documentation. Prior to the verified source fix, the doc category index refresh resolves linked titles for private messages or restricted category topics without enforcing the viewer's authorization. A user who can edit the index topic can use this behavior to learn titles that the user is not authorized to view, although the advisory does not establish access to topic contents. This vulnerability is addressed by commit b15d4de02ad29d7c9525346afee51fef4a2c605a.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileReadAlso CWE-200
  • Open Zaak: Path traversal / arbitrary server-file read via Documenten API document import (bestandspad)Also CWE-200
  • Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handlingSame generic ecosystem
  • Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolverSame generic ecosystem
  • RIOT: Potential integer overflow in nanocoap Block2 handling leading to out-of-bounds memory accessSame generic ecosystem
  • RIOT: Remote Stack Buffer Overflow in ATWINC15x0 driver via unsanitized SSIDSame generic ecosystem

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200
Source
CVE List V5
Source checked
Oct 16, 2026
References
2 linked sources
Open source record