{"id":"CVE-2026-116072","kind":"vulnerability","aliases":["CVE-2026-116072"],"related":[],"title":"Infinity for Reddit: hardcoded OAuth state lets attackers log victims into their account","description":"Infinity for Reddit through 8.3.4 contains a login cross-site request forgery vulnerability that allows attackers to log victims into an attacker-controlled account because the exported LoginChromeCustomTabActivity redirect handler checks a hardcoded OAuth state value. Attackers can authorize the app's client ID with their own Reddit account, then deliver an infinity://localhost redirect containing their code and the constant state, causing the victim's posts, messages, and browsing to occur on the attacker's account.","summary":"Infinity for Reddit, an Android client, accepts a login redirect that checks a hardcoded OAuth state value, so an attacker can craft a link that logs the victim into the attacker's Reddit account. The victim's posts, messages and browsing then happen on the attacker's account.","severity":"medium","cvss":5.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["android","mobile","package","reddit-client"],"not_affected_if":["newer-version"],"how_to_check":"- Check the installed Infinity for Reddit version in the app's About screen or package settings; the flaw is described for versions through `8.3.4`.","fix":"- Update Infinity for Reddit to a version later than `8.3.4`; the sources do not name the fixed version.\n- Unknown whether a patched release exists; check the project's releases.","status":"open","published_at":"2026-10-25T12:16:29+00:00","first_seen_at":"2026-10-25T12:40:44+00:00","triaged_at":"2026-10-25T12:41:31+00:00","updated_at":"2026-10-25T12:41:31+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T12:41:31Z","model":"claude-haiku-5-5","output":{"fix":"- Update Infinity for Reddit to a version later than `8.3.4`; the sources do not name the fixed version.\n- Unknown whether a patched release exists; check the project's releases.","reach":"internet","title":"Infinity for Reddit: hardcoded OAuth state lets attackers log victims into their account","impact":"medium","summary":"Infinity for Reddit, an Android client, accepts a login redirect that checks a hardcoded OAuth state value, so an attacker can craft a link that logs the victim into the attacker's Reddit account. The victim's posts, messages and browsing then happen on the attacker's account.","category":"package","nicknames":[],"who_cares":["android","reddit-client","mobile"],"confidence":0.6,"needs_auth":"no","worst_case":"victim's Reddit activity runs on attacker's account","analyst_note":"Confirm the first fixed version and whether a release exists, via the project repository or the NVD entry.","how_to_check":"- Check the installed Infinity for Reddit version in the app's About screen or package settings; the flaw is described for versions through `8.3.4`.","needs_analyst":true,"not_affected_if":["newer-version"],"who_is_affected":"Users of the Infinity for Reddit Android app at version `8.3.4` or earlier who sign in to Reddit through the app. People who do not use this app, or who run a newer build, are not described as affected. The sources do not say whether other Reddit clients share the flaw.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000607,"input_tokens":3389,"output_tokens":537,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116072':16A,19A '-2026':15A,18A '8.3.4':78C 'accept':32B 'account':13A,59B,73B,99C,124C,151C 'allow':89C 'android':20B,30B 'app':116C 'attack':8A,45B,56B,71B,90C,97C,112C,149C 'attacker-control':96C 'author':114C 'brows':66B,144C 'caus':137C 'check':37B,106C 'client':25B,31B,118C 'code':132C 'constant':135C 'contain':79C,130C 'control':98C 'craft':47B 'cross':83C 'cross-sit':82C 'cve':14A,17A 'deliv':126C 'export':102C 'forgeri':86C 'handler':105C 'happen':68B 'hardcod':4A,39B,108C 'id':119C 'infin':1A,26B,74C 'let':7A 'link':49B 'localhost':128C 'log':9A,51B,92C 'login':34B,81C 'loginchromecustomtabact':103C 'messag':64B,142C 'mobil':21B 'oauth':5A,40B,109C 'occur':146C 'packag':22B 'post':63B,141C 'reddit':3A,24B,28B,58B,76C,123C 'reddit-cli':23B 'redirect':35B,104C,129C 'request':85C 'site':84C 'state':6A,41B,110C,136C 'valu':42B,111C 'victim':10A,53B,61B,93C,139C 'vulner':87C","nicknames":[],"mitigations":[],"who_affected":"Users of the Infinity for Reddit Android app at version `8.3.4` or earlier who sign in to Reddit through the app. People who do not use this app, or who run a newer build, are not described as affected. The sources do not say whether other Reddit clients share the flaw.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-25T12:16:29+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-2026-116072","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116072","severity":null,"published_at":"2026-10-25T12:16:29+00:00","modified_at":"2026-10-25T12:16:29+00:00","first_seen_at":"2026-10-25T12:40:44+00:00","fetched_at":"2026-10-25T12:40:44+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}