CVE-2026-82450

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Source
https://cve.org/CVERecord?id=CVE-2026-82450
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82450.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-82450
Published
2026-08-29T13:47:53.312Z
Modified
2026-09-02T03:30:53.674857721Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
BookStack before 26.05.4 Remote Code Execution via Book Cover
Details

BookStack before 26.05.4 contains a remote code execution vulnerability in the portable ZIP import functionality that allows users with Import Content and Create Books permissions to upload a PHP polyglot file as a book cover. Attackers can bypass image extension validation by embedding a PHP file with a .php filename in the ZIP archive, which is stored in the public web root and executed by unauthenticated requests.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82450.json",
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-434"
    ]
}
References

Affected packages

Git / github.com/bookstackapp/bookstack

Affected ranges

Type
GIT
Repo
https://github.com/bookstackapp/bookstack
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
cec78b1bcf096a74bf0a79fae3f884dc1d0803e4
Fixed
e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6
Database specific
Show details 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "26.05.4"
        }
    ]
}

Affected versions

0.*
0.7.2
v.*
v.0.7.1
v0.*
v0.10.0
v0.11.0
v0.11.1
v0.11.2
v0.12.0
v0.12.1
v0.12.2
v0.13.0
v0.13.1
v0.14.0
v0.14.1
v0.14.2
v0.14.3
v0.15.0
v0.15.1
v0.15.2
v0.15.3
v0.16.0
v0.16.1
v0.16.2
v0.16.3
v0.17.0
v0.17.1
v0.17.2
v0.17.3
v0.17.4
v0.18.0
v0.18.1
v0.18.2
v0.18.3
v0.18.4
v0.18.5
v0.19.0
v0.20.0
v0.20.1
v0.20.2
v0.20.3
v0.21.0
v0.22.0
v0.23.0
v0.23.1
v0.23.2
v0.24.0
v0.24.1
v0.24.2
v0.24.3
v0.25.0
v0.25.1
v0.25.2
v0.25.3
v0.25.4
v0.25.5
v0.26.0
v0.26.1
v0.26.2
v0.26.3
v0.26.4
v0.27
v0.27.1
v0.27.2
v0.27.3
v0.27.4
v0.27.5
v0.28.0
v0.28.1
v0.28.2
v0.28.3
v0.29.0
v0.29.1
v0.29.2
v0.29.3
v0.30.0
v0.30.1
v0.30.2
v0.30.3
v0.30.4
v0.30.5
v0.30.6
v0.30.7
v0.31.0
v0.31.1
v0.31.2
v0.31.3
v0.31.4
v0.31.5
v0.31.6
v0.31.7
v0.31.8
v0.5.0
v0.6.0
v0.6.1
v0.6.2
v0.6.3
v0.7.0
v0.7.3
v0.7.4
v0.7.5
v0.7.6
v0.8.0
v0.8.1
v0.8.2
v0.9.0
v0.9.1
v0.9.2
v0.9.3
v21.*
v21.04
v21.04.1
v21.04.2
v21.04.3
v21.04.4
v21.04.5
v21.04.6
v21.05
v21.05.1
v21.05.2
v21.05.3
v21.05.4
v21.08
v21.08.1
v21.08.2
v21.08.3
v21.08.4
v21.08.5
v21.08.6
v21.10
v21.10.1
v21.10.2
v21.10.3
v21.11
v21.11.1
v21.11.2
v21.11.3
v21.12
v21.12.1
v21.12.2
v21.12.3
v21.12.4
v21.12.5
v22.*
v22.02
v22.02.1
v22.02.2
v22.02.3
v22.03
v22.03.1
v22.04
v22.04.1
v22.04.2
v22.06
v22.06.1
v22.06.2
v22.07
v22.07.1
v22.07.2
v22.07.3
v22.09
v22.09.1
v22.10
v22.10.1
v22.10.2
v22.11
v22.11.1
v23.*
v23.01
v23.01.1
v23.02
v23.02.1
v23.02.2
v23.02.3
v23.05
v23.05.1
v23.05.2
v23.06
v23.06.1
v23.06.2
v23.08
v23.08.1
v23.08.2
v23.08.3
v23.10
v23.10.1
v23.10.2
v23.10.3
v23.10.4
v23.12
v23.12.1
v23.12.2
v23.12.3
v24.*
v24.02
v24.02.1
v24.02.2
v24.02.3
v24.05
v24.05.1
v24.05.2
v24.05.3
v24.05.4
v24.10
v24.10.1
v24.10.2
v24.10.3
v24.11.4
v24.12
v24.12.1
v25.*
v25.02
v25.02.1
v25.02.2
v25.02.3
v25.02.4
v25.02.5
v25.05
v25.05.1
v25.05.2
v25.07
v25.07.1
v25.07.2
v25.07.3
v25.11
v25.11.1
v25.11.2
v25.11.3
v25.11.4
v25.11.5
v25.11.6
v25.12
v25.12.1
v25.12.2
v25.12.3
v25.12.4
v25.12.5
v25.12.6
v25.12.7
v25.12.8
v25.12.9
v26.*
v26.03
v26.03.1
v26.03.2
v26.03.3
v26.03.4
v26.03.5
v26.05
v26.05.1
v26.05.2
v26.05.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82450.json"