{"answers":{"affected":"It affects 2 products.","exploited":"Yes. Attackers have exploited CVE-2026-42897 in the wild since at least 15 May 2026.","fix":"No fix has been published for CVE-2026-42897 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 29 May 2026.","what":"CVE-2026-42897 is a high-severity cross-site scripting vulnerability in Microsoft Exchange Server, published on 14 May 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-2026-42897 and fix it if it is affected.\n\nWhat it is: CVE-2026-42897 is a high-severity cross-site scripting vulnerability in Microsoft Exchange Server, published on 14 May 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: Yes. Attackers have exploited CVE-2026-42897 in the wild since at least 15 May 2026.\n\nAffected product: Microsoft Exchange Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-42897/ (Markdown: https://insights.sbomify.com/CVE-2026-42897/index.md)","id":"CVE-2026-42897","markdown":"https://insights.sbomify.com/CVE-2026-42897/index.md","name":"CVE-2026-42897","record":{"aliases":["GHSA-3c39-338m-m4vp"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Microsoft Exchange Server","requires_auth":"none","summary":"An attacker can perform spoofing attacks via cross-site scripting in Microsoft Exchange Server, requiring a patch to mitigate.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"exchange_server","vendor":"microsoft"},{"product":"exchange_server_subscription_edition","vendor":"microsoft"}],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-05-15","github_poc":1,"max_poc_stars":5,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-05-15T11:24:36Z","kind":"github_poc","ref":"https://github.com/atiilla/CVE-2026-42897","stars":5,"title":"CVE-2026-42897 - Exchange Health Checker blind spot: outbound IIS URL Rewrite rules silently ignored, making EOMT mitigations invisible in diagnostic reports."}],"tier":"exploited"},"has_fix":null,"headline":"Microsoft Exchange Server Cross-Site Scripting","id":"CVE-2026-42897","indexable":true,"kev":{"dateAdded":"2026-05-15","dueDate":"2026-05-29","knownRansomwareCampaignUse":"Unknown","product":"Microsoft","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","vendorProject":"Microsoft","vulnerabilityName":"Microsoft Exchange Server Cross-Site Scripting Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"microsoft:exchange_server","products":["microsoft:exchange_server"],"type":"xss","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability","id":"CVE-2026-42898"},"packages":[],"prev":{"headline":"Windows DWM Core Library Elevation of Privilege Vulnerability","id":"CVE-2026-42896"},"products":["Microsoft Exchange Server 2016 Cumulative Update 23","Microsoft Exchange Server 2019 Cumulative Update 14","Microsoft Exchange Server 2019 Cumulative Update 15","Microsoft Exchange Server Subscription Edition RTM"],"published":"2026-05-14","related":[{"cvss_score":9.8,"headline":"Microsoft Exchange Server Privilege Escalation","id":"CVE-2024-21410","kev_date_added":"2024-02-15","published":"2024-02-13"},{"cvss_score":9.1,"headline":"Microsoft Exchange Server Remote Code Execution","id":"CVE-2021-34473","kev_date_added":"2021-11-03","published":"2021-07-14"},{"cvss_score":9.1,"headline":"Microsoft Exchange Server Remote Code Execution","id":"CVE-2021-26855","kev_date_added":"2021-11-03","published":"2021-03-02"},{"cvss_score":9,"headline":"Microsoft Exchange Server Privilege Escalation","id":"CVE-2021-34523","kev_date_added":"2021-11-03","published":"2021-07-14"},{"cvss_score":8.8,"headline":"Microsoft Exchange Server Deserialization of Untrusted Data","id":"CVE-2023-21529","kev_date_added":"2026-04-13","published":"2023-02-14"},{"cvss_score":8.8,"headline":"Microsoft Exchange Server Privilege Escalation","id":"CVE-2022-41080","kev_date_added":"2023-01-10","published":"2022-11-09"},{"cvss_score":8.8,"headline":"Microsoft Exchange Server Server-Side Request Forgery","id":"CVE-2022-41040","kev_date_added":"2022-09-30","published":"2022-10-03"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-10","vendors":["Microsoft"]},"summary":"An attacker can perform spoofing attacks via cross-site scripting in Microsoft Exchange Server, requiring a patch to mitigate.","url":"https://insights.sbomify.com/CVE-2026-42897/"}