{"id":"CVE-2026-125366","kind":"vulnerability","aliases":["CVE-2026-125366"],"related":[],"title":"Omnom: authenticated users can make server fetch internal hosts via feed URLs","description":"Omnom through 0.9.0 contains a server-side request forgery vulnerability that allows authenticated users to make server requests to arbitrary hosts by submitting feed URLs to /add_feed. Attackers can supply internal addresses that getFeedInfo, gofeed ParseURL, and fetchImageAsInlineURL fetch without validation, using reflected error messages to probe internal hosts and ports.","summary":"Omnom through 0.9.0 lets a logged-in user submit feed URLs to /add_feed, and the server fetches them without checking the destination. An attacker can point those requests at internal addresses and read reflected error messages to map internal hosts and ports.","severity":"medium","cvss":5.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["omnom","package","self-hosted"],"not_affected_if":["no-untrusted-accounts"],"how_to_check":"- Check the Omnom version in use; the sources say versions through `0.9.0` are affected.\n- Look for exposure of the `/add_feed` endpoint on instances reachable by users who hold accounts.","fix":null,"status":"open","published_at":"2026-11-10T00:17:08+00:00","first_seen_at":"2026-11-10T00:28:42+00:00","triaged_at":"2026-11-10T00:30:32+00:00","updated_at":"2026-11-10T00:30:32+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-10T00:30:32Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Omnom: authenticated users can make server fetch internal hosts via feed URLs","impact":"medium","summary":"Omnom through 0.9.0 lets a logged-in user submit feed URLs to /add_feed, and the server fetches them without checking the destination. An attacker can point those requests at internal addresses and read reflected error messages to map internal hosts and ports.","audience":"businesses","category":"package","nicknames":[],"who_cares":["omnom","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"internal hosts probed and their services mapped through error messages","analyst_note":"Confirm the fixed version and whether a patch exists via the linked github.com fix page and the VulnCheck advisory.","how_to_check":"- Check the Omnom version in use; the sources say versions through `0.9.0` are affected.\n- Look for exposure of the `/add_feed` endpoint on instances reachable by users who hold accounts.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-untrusted-accounts"],"who_is_affected":"Teams that self-host Omnom and let users with accounts add feeds. The flaw sits in the feed-adding path, which fetches arbitrary user-supplied URLs server-side. Instances where only trusted admins can log in are at lower risk, but the sources do not say more.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000726,"input_tokens":4623,"output_tokens":527,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-125366':15A,18A '-2026':14A,17A '/add_feed':37B,94C '0.9.0':26B,69C 'address':55B,99C 'allow':79C 'arbitrari':87C 'attack':48B,95C 'authent':2A,80C 'check':44B 'contain':70C 'cve':13A,16A 'destin':46B 'error':59B,111C 'feed':11A,34B,91C 'fetch':7A,41B,106C 'fetchimageasinlineurl':105C 'forgeri':76C 'getfeedinfo':101C 'gofe':102C 'host':9A,23B,64B,88C,116C 'intern':8A,54B,63B,98C,115C 'let':27B 'log':30B 'logged-in':29B 'make':5A,83C 'map':62B 'messag':60B,112C 'omnom':1A,19B,24B,67C 'packag':20B 'parseurl':103C 'point':50B 'port':66B,118C 'probe':114C 'read':57B 'reflect':58B,110C 'request':52B,75C,85C 'self':22B 'self-host':21B 'server':6A,40B,73C,84C 'server-sid':72C 'side':74C 'submit':33B,90C 'suppli':97C 'url':12A,35B,92C 'use':109C 'user':3A,32B,81C 'valid':108C 'via':10A 'vulner':77C 'without':43B,107C","nicknames":[],"mitigations":[],"who_affected":"Teams that self-host Omnom and let users with accounts add feeds. The flaw sits in the feed-adding path, which fetches arbitrary user-supplied URLs server-side. Instances where only trusted admins can log in are at lower risk, but the sources do not say more.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","omnom","package","selfhosted"],"campaign_type":null,"search_a":"'-125366':15A,18A '-2026':14A,17A 'authent':2A 'cve':13A,16A 'feed':11A 'fetch':7A 'host':9A 'intern':8A 'make':5A 'omnom':1A 'server':6A 'url':12A 'user':3A 'via':10A","search_b":"'/add_feed':37B '0.9.0':26B 'address':55B 'attack':48B 'check':44B 'destin':46B 'error':59B 'feed':34B 'fetch':41B 'host':23B,64B 'intern':54B,63B 'let':27B 'log':30B 'logged-in':29B 'map':62B 'messag':60B 'omnom':19B,24B 'packag':20B 'point':50B 'port':66B 'read':57B 'reflect':58B 'request':52B 'self':22B 'self-host':21B 'server':40B 'submit':33B 'url':35B 'user':32B 'without':43B","search_c":"'/add_feed':94C '0.9.0':69C 'address':99C 'allow':79C 'arbitrari':87C 'attack':95C 'authent':80C 'contain':70C 'error':111C 'feed':91C 'fetch':106C 'fetchimageasinlineurl':105C 'forgeri':76C 'getfeedinfo':101C 'gofe':102C 'host':88C,116C 'intern':98C,115C 'make':83C 'messag':112C 'omnom':67C 'parseurl':103C 'port':118C 'probe':114C 'reflect':110C 'request':75C,85C 'server':73C,84C 'server-sid':72C 'side':74C 'submit':90C 'suppli':97C 'url':92C 'use':109C 'user':81C 'valid':108C 'vulner':77C 'without':107C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T00:17:08+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/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:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-125366","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125366","severity":null,"published_at":"2026-11-10T00:17:08+00:00","modified_at":"2026-11-10T00:17:08+00:00","first_seen_at":"2026-11-10T00:28:42+00:00","fetched_at":"2026-11-10T00:28:42+00:00","note":null}],"documents":[{"id":111511,"url":"https://github.com/asciimoo/omnom/commit/01c45510ab06c51bc952901514735b457a492f10","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":111512,"url":"https://www.vulncheck.com/advisories/omnom-through-0.9.0-ssrf-via-add-feed-add-feed-route","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}