{"id":"CVE-2026-120845","kind":"vulnerability","aliases":["CVE-2026-120845"],"related":[],"title":"WordPress Smush plugin: stored cross-site scripting through 4.3.5","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPMU DEV Smush Image Compression and Optimization wp-smushit allows Stored XSS.This issue affects Smush Image Compression and Optimization: from n/a through 4.3.5.","summary":"The Smush Image Compression and Optimization WordPress plugin (wp-smushit) fails to neutralize input when generating pages, enabling stored cross-site scripting. An attacker who can get script stored in the plugin's data can run it in the browser of other users, such as site administrators.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["runtime","self-hosted","smush","wordpress","wp-smushit"],"not_affected_if":["plugin-not-installed"],"how_to_check":"- Check the installed Smush version in the WordPress admin plugin list or the `wp-smushit` plugin header; versions through `4.3.5` are listed as affected.","fix":"- Move to a Smush version later than `4.3.5`; the sources do not name the exact fixed version.","status":"open","published_at":"2026-11-06T23:17:21+00:00","first_seen_at":"2026-11-06T23:44:35+00:00","triaged_at":"2026-11-06T23:45:08+00:00","updated_at":"2026-11-06T23:45:08+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-06T23:45:08Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a Smush version later than `4.3.5`; the sources do not name the exact fixed version.","reach":"internet","title":"WordPress Smush plugin: stored cross-site scripting through 4.3.5","impact":"medium","summary":"The Smush Image Compression and Optimization WordPress plugin (wp-smushit) fails to neutralize input when generating pages, enabling stored cross-site scripting. An attacker who can get script stored in the plugin's data can run it in the browser of other users, such as site administrators.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["wordpress","smush","wp-smushit","self-hosted"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker script runs in other users' browsers, possibly admins","analyst_note":"Confirm the fixed version and the privilege needed to store the payload from the WPMU DEV or NVD advisory page.","how_to_check":"- Check the installed Smush version in the WordPress admin plugin list or the `wp-smushit` plugin header; versions through `4.3.5` are listed as affected.","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed"],"who_is_affected":"Sites running the Smush Image Compression and Optimization plugin (wp-smushit) at version 4.3.5 or earlier. The sources do not state which user roles can inject the stored script, so the exposure level is unknown.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000701,"input_tokens":4239,"output_tokens":555,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-120845':13A,16A '-2026':12A,15A '4.3.5':10A,112C 'administr':74B 'affect':103C 'allow':99C 'attack':51B 'browser':67B 'compress':29B,93C,106C 'cross':6A,47B,84C 'cross-sit':5A,46B,83C 'cve':11A,14A 'data':61B 'dev':90C 'enabl':44B 'fail':37B 'generat':42B,82C 'get':54B 'host':20B 'imag':28B,92C,105C 'improp':75C 'input':40B,78C 'issu':102C 'n/a':110C 'neutral':39B,76C 'optim':31B,95C,108C 'page':43B,81C 'plugin':3A,33B,59B 'run':63B 'runtim':17B 'script':8A,49B,55B,86C 'self':19B 'self-host':18B 'site':7A,48B,73B,85C 'smush':2A,21B,27B,91C,104C 'smushit':25B,36B,98C 'store':4A,45B,56B,100C 'user':70B 'vulner':87C 'web':80C 'wordpress':1A,22B,32B 'wp':24B,35B,97C 'wp-smushit':23B,34B,96C 'wpmu':89C 'xss.this':101C","nicknames":[],"mitigations":[],"who_affected":"Sites running the Smush Image Compression and Optimization plugin (wp-smushit) at version 4.3.5 or earlier. The sources do not state which user roles can inject the stored script, so the exposure level is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","runtime","selfhosted","smush","wordpress","wpsmushit"],"campaign_type":null,"search_a":"'-120845':13A,16A '-2026':12A,15A '4.3.5':10A 'cross':6A 'cross-sit':5A 'cve':11A,14A 'plugin':3A 'script':8A 'site':7A 'smush':2A 'store':4A 'wordpress':1A","search_b":"'administr':74B 'attack':51B 'browser':67B 'compress':29B 'cross':47B 'cross-sit':46B 'data':61B 'enabl':44B 'fail':37B 'generat':42B 'get':54B 'host':20B 'imag':28B 'input':40B 'neutral':39B 'optim':31B 'page':43B 'plugin':33B,59B 'run':63B 'runtim':17B 'script':49B,55B 'self':19B 'self-host':18B 'site':48B,73B 'smush':21B,27B 'smushit':25B,36B 'store':45B,56B 'user':70B 'wordpress':22B,32B 'wp':24B,35B 'wp-smushit':23B,34B","search_c":"'4.3.5':112C 'affect':103C 'allow':99C 'compress':93C,106C 'cross':84C 'cross-sit':83C 'dev':90C 'generat':82C 'imag':92C,105C 'improp':75C 'input':78C 'issu':102C 'n/a':110C 'neutral':76C 'optim':95C,108C 'page':81C 'script':86C 'site':85C 'smush':91C,104C 'smushit':98C 'store':100C 'vulner':87C 'web':80C 'wp':97C 'wp-smushit':96C 'wpmu':89C 'xss.this':101C","first_public_at":"2026-11-06T23:17:21+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","cvss_by":"audit@patchstack.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-120845","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120845","severity":null,"published_at":"2026-11-06T23:17:21+00:00","modified_at":"2026-11-06T23:17:21+00:00","first_seen_at":"2026-11-06T23:44:35+00:00","fetched_at":"2026-11-06T23:44:35+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}