{"answers":{"affected":"2 open source packages ship an affected version, including net.sourceforge.plantuml:plantuml. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-0858 in the wild and no public exploit code.","fix":"Upgrade net.sourceforge.plantuml:plantuml to 1.2026.0 or later.","what":"CVE-2026-0858 is a medium-severity cross-site scripting vulnerability in net.sourceforge.plantuml:plantuml, published on 16 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-0858 and fix it if it is affected.\n\nWhat it is: CVE-2026-0858 is a medium-severity cross-site scripting vulnerability in net.sourceforge.plantuml:plantuml, published on 16 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-0858 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- net.sourceforge.plantuml:plantuml (Maven): affected all versions; fixed in 1.2026.0\n- net.sourceforge.plantuml:plantuml (Maven): affected all versions; fixed in 1.2026.0\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-0858/ (Markdown: https://insights.sbomify.com/CVE-2026-0858/index.md)","id":"CVE-2026-0858","markdown":"https://insights.sbomify.com/CVE-2026-0858/index.md","name":"CVE-2026-0858","record":{"aliases":["DEBIAN-CVE-2026-0858","GHSA-hrvf-g648-rf3m","UBUNTU-CVE-2026-0858"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"PlantUML library","requires_auth":"none","summary":"Attackers can inject malicious JavaScript into PlantUML diagrams, leading to arbitrary script execution in applications rendering the SVG output.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"plantuml","vendor":"plantuml"}],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams. As a result, a crafted PlantUML diagram can inject malicious JavaScript into generated SVG output, leading to arbitrary script execution in the context of applications that render the SVG.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"PlantUML is vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams","id":"CVE-2026-0858","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"TYPO3 CMS Allows Insecure Deserialization via Mailer File Spool","id":"CVE-2026-0859"},"packages":[{"ecosystem":"Maven","fixed":["1.2026.0"],"introduced":["0"],"last_affected":[],"package":"net.sourceforge.plantuml:plantuml","purl":null,"source":"GHSA-hrvf-g648-rf3m"},{"ecosystem":"Maven","fixed":["1.2026.0"],"introduced":["0"],"last_affected":[],"package":"net.sourceforge.plantuml:plantuml","purl":"pkg:maven/net.sourceforge.plantuml/plantuml","source":"GHSA-hrvf-g648-rf3m"}],"prev":{"headline":"Weak cryptography in Meona Client","id":"CVE-2026-0857"},"products":["net.sourceforge.plantuml:plantuml"],"published":"2026-01-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-16","vendors":["n/a"]},"summary":"Attackers can inject malicious JavaScript into PlantUML diagrams, leading to arbitrary script execution in applications rendering the SVG output.","url":"https://insights.sbomify.com/CVE-2026-0858/"}