Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-2703— xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one

Quick assessment

Affected
xlnt-community xlnt
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.

xlnt是xlnt-community开源的一个C++语言库。 xlnt 1.6.1及之前版本存在安全漏洞，该漏洞源于文件source/detail/cryptography/base64.cpp中函数xlnt::detail::decode_base64存在差一错误。

CVSS 3.3 · Low EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-2703

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
xlnt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlnt是xlnt-community开源的一个C++语言库。 xlnt 1.6.1及之前版本存在安全漏洞，该漏洞源于文件source/detail/cryptography/base64.cpp中函数xlnt::detail::decode_base64存在差一错误。
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
xlnt-community xlnt 1.6.0 -

II. Public POCs for CVE-2026-2703

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-2703

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-2703 (1)

IV. Related Vulnerabilities

Same product: xlnt
Same vendor: xlnt-community
Same weakness: CWE-193

V. Comments for CVE-2026-2703

No comments yet

Leave a comment