CVE Explorer
CVE-2026-35453
PhpSpreadsheet is a library for reading and writing spreadsheet files. In versions 1.30.3 and earlier, 2.0.0 through 2.1.15, 2.2.0 through 2.4.4, 3.3.0 through 3.10.4, and 4.0.0 through 5.6.0, the HTML Writer skips htmlspecialchars() output escaping when a cell uses a custom number format containing the @ text placeholder with additional literal text (e.g., @ "items"). The escaping is only applied when the formatted output strictly equals the original cell value. When the format code contains @
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"PhpSpreadsheet","vendor":"PHPOffice","versions":[{"status":"affected","version":">= 4.0.0, <= 5.6.0"},{"status":"affected","version":">= 3.3.0, <= 3.10.4"},{"status":"affected","version":">= 2.2.0, <= 2.4.4"},{"status":"affected","version":">= 2.0.0, <= 2.1.15"},{"status":"affected","version":"<= 1.30.3"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:b11efa7c6a85bc9979025e3e8ab914ea73e638230ba5453a5c04534505268555 · sha256:c2255487d84704cf… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:b11efa7c6a85bc9979025e3e8ab914ea73e638230ba5453a5c04534505268555 · sha256:c2255487d84704cf… · /containers/cna/metrics/0/cvssV4_0
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:b11efa7c6a85bc9979025e3e8ab914ea73e638230ba5453a5c04534505268555 · sha256:c2255487d84704cf… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"tags":["exploit"],"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-6wpp-88cp-7q68"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b11efa7c6a85bc9979025e3e8ab914ea73e638230ba5453a5c04534505268555 · sha256:c2255487d84704cf… · /containers/adp/0/references/0
{"name":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-6wpp-88cp-7q68","tags":["x_refsource_CONFIRM"],"url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-6wpp-88cp-7q68"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b11efa7c6a85bc9979025e3e8ab914ea73e638230ba5453a5c04534505268555 · sha256:c2255487d84704cf… · /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.