# CVE-2026-75529: Stored Cross-Site Scripting via MIME-Type Confusion in PDF Downloads of Pandora > Attackers can execute arbitrary scripts in victims' browsers via stored XSS in Pandora's PDF download feature, potentially accessing sensitive application data. - **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 17 Aug 2026 - **Updated:** 18 Aug 2026 ## What is CVE-2026-75529? CVE-2026-75529 is a medium-severity cross-site scripting vulnerability in pandora-analysis pandora, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description Pandora is affected by a stored cross-site scripting vulnerability in the PDF download functionality. The /task-download//.../pdf endpoint verifies that the submitted file is a PDF using Pandora's content-based file-type detection, but previously returned the file using send_file(task.file.path) without explicitly specifying the MIME type or forcing it to be downloaded as an attachment. Because Flask determines the response MIME type from the filename when a path is supplied, an attacker could submit a file whose content is recognized by Pandora as a PDF while its filename or extension causes the download endpoint to return it with a different, potentially active MIME type. A specially crafted PDF/polyglot file could therefore be served inline and interpreted by a victim's browser as HTML or another executable web format. If a victim with access to the submitted analysis follows the PDF download link, attacker-controlled script could execute in the security context of the Pandora application, potentially allowing access to application data or actions using the victim's session. The patch prevents the issue by explicitly returning PDF downloads with Content-Type: application/pdf, forcing Content-Disposition: attachment, and assigning a trusted .pdf filename based on the task UUID. Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation) ## Which versions are affected by CVE-2026-75529? ## How do I fix CVE-2026-75529? No fix has been published for CVE-2026-75529 yet. Limit exposure of the affected software until one is available. ## Is CVE-2026-75529 being exploited? There is no known exploitation of CVE-2026-75529 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-75529 and fix it if it is affected. What it is: CVE-2026-75529 is a medium-severity cross-site scripting vulnerability in pandora-analysis pandora, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-75529 in the wild and no public exploit code. Affected product: pandora-analysis pandora. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-75529/ (Markdown: https://insights.sbomify.com/CVE-2026-75529/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75529 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75529 - OSV: https://osv.dev/vulnerability/CVE-2026-75529 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-75529/ Summaries are generated and may contain mistakes; the official description above is the record.