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CVE-2026-33347

league/commonmark is a PHP Markdown parser. From version 2.3.0 to before version 2.8.2, the DomainFilteringAdapter in the Embed extension is vulnerable to an allowlist bypass due to a missing hostname boundary assertion in the domain-matching regex. An attacker-controlled domain like youtube.com.evil passes the allowlist check when youtube.com is an allowed domain. This issue has been patched in version 2.8.2.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:aca917b4d9b4dfc6055ebf5231859ead336ff522d1b881052e26fcc4b2ff43da
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-185","description":"CWE-185: Incorrect Regular Expression","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

1 source assertion
{"product":"commonmark","vendor":"thephpleague","versions":[{"status":"affected","version":">= 2.3.0, < 2.8.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

3 source assertions
{"cweId":"CWE-185","description":"CWE-185: Incorrect Regular Expression","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/problemTypes/2/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/thephpleague/commonmark/commit/59fb075d2101740c337c7216e3f32b36c204218b","tags":["x_refsource_MISC"],"url":"https://github.com/thephpleague/commonmark/commit/59fb075d2101740c337c7216e3f32b36c204218b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/references/1
{"name":"https://github.com/thephpleague/commonmark/releases/tag/2.8.2","tags":["x_refsource_MISC"],"url":"https://github.com/thephpleague/commonmark/releases/tag/2.8.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/references/2
{"name":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-hh8v-hgvp-g3f5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-hh8v-hgvp-g3f5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47af1aa8a39c21e7a3a34ded60068ca0188ab82e4fe327739f5b2dba46f4fce3 · sha256:2f761d94fa220ae5… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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