EUVD-2026-62486Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable admin handler (AV:N/AC:L) but requires administrator privileges (PR:H, no UI); injected code escapes the web app to run as the OS service account (S:C) with full C/I/A impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
MyBooks is an enhanced and easy-to-use personal ebook management web server also known as Talebook. In 3.41.2 and earlier, the AdminSettings.post handler in webserver/handlers/admin.py accepts SOCIAL_AUTH key names without validating quotes or newline characters, and SettingsLoader.dumpfile in webserver/loader.py concatenates those names into the generated Python source file auto.py without escaping them. An administrator can submit a crafted SOCIAL_AUTH key name that closes the settings dictionary and injects arbitrary Python statements. The application later executes those statements because SettingsLoader.loadfile imports auto.py as a module, and setting autoreload to true invokes restart_async so a process supervisor restarts the service and triggers the import. Successful exploitation executes commands with the privileges of the application service account and can disclose data, modify files, establish persistence, or disrupt the service. Related authorization and registration vulnerabilities can reduce the effective privilege requirement in a chained attack, but the standalone vulnerability requires administrator access. This issue is fixed in version 3.42.0.
Articles & Coverage 1
AnalysisAI
Authenticated remote code execution affects Talebook (MyBooks/PoxenStudio) ebook management server versions 3.41.2 and earlier, where an administrator can inject arbitrary Python into the auto-generated auto.py settings module via a crafted SOCIAL_AUTH key name. Because the server imports auto.py as a live module and can auto-restart to reload it, injected statements execute with the service account's privileges, enabling data disclosure, file modification, persistence, or service disruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated administrator account (PR:H) able to reach the AdminSettings.post handler in webserver/handlers/admin.py, and the ability to submit a SOCIAL_AUTH setting key containing quote/newline characters that break out of the generated dictionary in auto.py. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue for anyone running Talebook, but its real-world blast radius is bounded by the PR:H requirement in the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N) - exploitation as a standalone bug needs administrator access, which is why it is a privileged-RCE rather than an internet-spray worm. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Talebook 3.42.0, which escapes configuration keys with repr() in webserver/loader.py and adds a strict ^[A-Za-z0-9_]+$ allowlist for setting key names in webserver/handlers/admin.py (fixing commit a1780c98b00566af7da2fc099fe38500efc02e92; release https://github.com/PoxenStudio/mybooks/releases/tag/3.42.0; advisory GHSA-4wfr-9gcv-j638). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Talebook instances running version 3.41.2 or earlier and isolate them from network-critical systems; audit administrative accounts for unauthorized access and review authentication logs for suspicious activity. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
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External POC / Exploit Code
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