CVE Explorer
CVE-2026-42553
Cinny is a Matrix client. Prior to 4.10.3, A remote authenticated attacker who shares a room with a victim and has permissions to create room emotes (for example in a DM) can cause the victim's client to send their Matrix access token to an attacker-controlled server. This occurs when the victim opens the emoji or sticker picker for the room containing a malicious emote pack. This is caused by an incorrect fallback in EmojiBoard that uses untrusted pack.meta.avatar (user-controlled) without conv
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"cinny","vendor":"cinnyapp","versions":[{"status":"affected","version":"< 4.10.3"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:8922fa7a28deeffdceb20657efdb2e0a2d33261bde64681929a89035cdda1c55 · sha256:21f3a4001cab489a… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:8922fa7a28deeffdceb20657efdb2e0a2d33261bde64681929a89035cdda1c55 · sha256:21f3a4001cab489a… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:8922fa7a28deeffdceb20657efdb2e0a2d33261bde64681929a89035cdda1c55 · sha256:21f3a4001cab489a… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/cinnyapp/cinny/releases/tag/v4.10.3","tags":["x_refsource_MISC"],"url":"https://github.com/cinnyapp/cinny/releases/tag/v4.10.3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8922fa7a28deeffdceb20657efdb2e0a2d33261bde64681929a89035cdda1c55 · sha256:21f3a4001cab489a… · /containers/cna/references/1
{"name":"https://github.com/cinnyapp/cinny/security/advisories/GHSA-j944-w549-3453","tags":["x_refsource_CONFIRM"],"url":"https://github.com/cinnyapp/cinny/security/advisories/GHSA-j944-w549-3453"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8922fa7a28deeffdceb20657efdb2e0a2d33261bde64681929a89035cdda1c55 · sha256:21f3a4001cab489a… · /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.