CVE-2026-34413
Raw vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/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:XSummary
CVE-2026-34413 is a high-severity Exposure of Sensitive System Information to an Unauthorized Control Sphere (CWE-497) vulnerability. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique System Information Discovery (T1082); ranked in the top 13% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
Xerte Online Toolkits versions 3.15 and earlier are affected by CVE-2026-34413, a missing authentication vulnerability in the elFinder connector endpoint at /editor/elfinder/php/connector.php. The issue arises because an HTTP redirect sent to unauthenticated callers fails to invoke exit() or die(), permitting PHP execution to continue server-side and process the full request. This flaw, classified under CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere), carries a CVSS v3.1 base score of 8.6 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L).
Unauthenticated remote attackers can exploit this vulnerability to perform arbitrary file operations on project media directories, including creating directories, uploading files, renaming files, duplicating files, overwriting files, and deleting files. These capabilities can be chained with path traversal and extension blocklist vulnerabilities to achieve remote code execution and arbitrary file reads.
Mitigation is addressed in patches from the Xerte Online Toolkits project, including commits 02661be88cc369325ea01b508086bde7fbfec805, 17e4f945fe6a3400fa88c01eda18c1075ee4a212, and 507d55c5e91bf9310b5b1c7fad8aebfef902ad23 available on GitHub. A proof-of-concept for remote code execution is documented at https://github.com/bootstrapbool/xerteonlinetoolkits-rce, and the issue is tracked at https://github.com/thexerteproject/xerteonlinetoolkits/issues/1527. Security practitioners should apply these updates promptly to affected installations.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25067
Vulnerability Data
Xerte Online Toolkits versions 3.15 and earlier contain a missing authentication vulnerability in the elFinder connector endpoint at /editor/elfinder/php/connector.php where an HTTP redirect to unauthenticated callers does not call exit() or die(), allowing PHP execution to continue and process the…
more
full request server-side. Unauthenticated attackers can perform file operations on project media directories including creating directories, uploading files, renaming files, duplicating files, overwriting files, and deleting files, which can be chained with path traversal and extension blocklist vulnerabilities to achieve remote code execution and arbitrary file read.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
—
—
- 5 hardening rules · 4 OS baselines
V14.1.2
Mitigating Controls (NIST 800-53 r5) AI
Enforces approved authorizations for logical access, directly stopping unauthorized actors from reaching sensitive system information.
Enforces information flow policies that block sensitive system data from crossing into unauthorized control spheres.
Limits privileges so that only the minimum necessary access is granted, reducing the chance of exposing system-level details.
Controls communications at external and key internal boundaries to keep sensitive system information inside authorized spheres.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Enforcing least-privilege access permissions directly prevents unauthorized actors from reaching sensitive system information.
Protecting environments from unauthorized logical access stops exposure of internal system details to outsiders.
Secure-development practices reduce the chance of code paths that leak sensitive system information.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Keeping internal maps, directories, and signage from public view prevents disclosure of system or facility details that could aid reconnaissance or targeted attacks.
Hardening callouts derived
Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).
Oracle Linux 8 (2 rules)
- V-248551 A sticky bit must be set on all OL 8 public directories to prevent unauthorized and unintended information transferred via shared system resources. prevents CWE-497
- V-248580 OL 8 must prevent kernel profiling by unprivileged users. prevents CWE-497
RHEL 8 (1 rule)
- V-230270 RHEL 8 must prevent kernel profiling by unprivileged users. prevents CWE-497
Ubuntu 22.04 (1 rule)
- V-260470 Ubuntu 22.04 LTS, when booted, must require authentication upon booting into single-user and maintenance modes. prevents CWE-497
Ubuntu 24.04 (1 rule)
- V-270675 Ubuntu 24.04 LTS when booted must require authentication upon booting into single-user and maintenance modes. prevents CWE-497