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CVE-2026-35453— PhpSpreadsheet XSS via number format text substitution in HTML Writer

Quick assessment

Affected
PHPOffice PhpSpreadsheet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PhpSpreadsheet是PHPOffice开源的一款用于读取和写入电子表格文件的PHP库。 PhpSpreadsheet存在跨站脚本漏洞，该漏洞源于HTML Writer在单元格使用包含@文本占位符的自定义数字格式时跳过htmlspecialchars输出转义，可能导致注入任意HTML和JavaScript。以下版本受到影响：1.30.3及之前版本、2.0.0至2.1.15版本、2.2.0至2.4.4版本、3.3.0至3.10.4版本和4.0.0至5.6.0版本。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 5

VendorProduct Version RangeStatus
PHPOffice PhpSpreadsheet >= 4.0.0, <= 5.6.0 affected
>= 3.3.0, <= 3.10.4 affected
>= 2.2.0, <= 2.4.4 affected
>= 2.0.0, <= 2.1.15 affected
<= 1.30.3 affected
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I. Basic Information for CVE-2026-35453

Vulnerability Information
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Vulnerability Title
PhpSpreadsheet XSS via number format text substitution in HTML Writer
Source: CVE Program / CVE List V5
Vulnerability Description
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 @ with quoted literal text, the formatter substitutes the raw cell value into the format string and returns early without invoking the escaping callback. An attacker who can control cell content in a spreadsheet processed by the HTML Writer can inject arbitrary HTML and JavaScript into the generated output. This issue has been fixed in versions 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
PhpSpreadsheet 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PhpSpreadsheet是PHPOffice开源的一款用于读取和写入电子表格文件的PHP库。 PhpSpreadsheet存在跨站脚本漏洞，该漏洞源于HTML Writer在单元格使用包含@文本占位符的自定义数字格式时跳过htmlspecialchars输出转义，可能导致注入任意HTML和JavaScript。以下版本受到影响：1.30.3及之前版本、2.0.0至2.1.15版本、2.2.0至2.4.4版本、3.3.0至3.10.4版本和4.0.0至5.6.0版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHPOffice PhpSpreadsheet >= 4.0.0, <= 5.6.0 -

II. Public POCs for CVE-2026-35453

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III. Intelligence Information for CVE-2026-35453

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Vendor Advisories for CVE-2026-35453 (1)

IV. Related Vulnerabilities

Same product: PhpSpreadsheet
Same vendor: PHPOffice
Same weakness: CWE-79

V. Comments for CVE-2026-35453

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