CVE Explorer
CVE-2026-59923
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, HTMLRenderer.safe_url() does not block percent-encoded javascript URIs, allowing attacker-supplied Markdown links or images to bypass URL protections and execute script in rendered HTML. This issue is fixed in version 3.3.0.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"mistune","vendor":"lepture","versions":[{"status":"affected","version":"< 3.3.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/references/1
{"name":"https://github.com/lepture/mistune/releases/tag/v3.3.0","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/releases/tag/v3.3.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/references/2
{"name":"https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c12c6d9c0872aae5694b9ffc1d14825111c2ae7cced0e19ce756b7c976f881b8 · sha256:6b5e1ab2bc567e0d… · /containers/adp/0/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.