{"id":"CVE-2026-100108","kind":"vulnerability","aliases":["CVE-2026-100108"],"related":[],"title":"Social Share Buttons WordPress plugin: stored XSS via share_url parameter","description":"The Social Share Buttons plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form (containing share_url)' parameter in all versions up to, and including, 1.30 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that the 7-day review-nag timer has elapsed since the attacker's first wp-admin visit, as the nonce needed to reach the save-network handler is only rendered in the DOM once that timer has passed.","summary":"The Social Share Buttons plugin for WordPress up to and including 1.30 does not sanitize or escape the 'form (containing share_url)' parameter. An authenticated subscriber can store a script that runs in the browser of any visitor to the affected page.","severity":"medium","cvss":6.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","wordpress"],"not_affected_if":["auth-required","plugin-not-installed"],"how_to_check":"- Check the installed version of the Social Share Buttons plugin in the WordPress admin plugin list or `wp plugin get <plugin-slug> --field=version`\n- Confirm whether subscriber-level accounts can register on the site","fix":"- Update the Social Share Buttons plugin to a version newer than `1.30` (the sources do not name the fixed version: unknown)\n- If no fixed version is available, deactivate the plugin or restrict subscriber registration","status":"open","published_at":"2026-10-16T08:17:12+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","triaged_at":"2026-10-25T03:59:45+00:00","updated_at":"2026-10-25T03:59:45+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T03:59:45Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Social Share Buttons plugin to a version newer than `1.30` (the sources do not name the fixed version: unknown)\n- If no fixed version is available, deactivate the plugin or restrict subscriber registration","reach":"internet","title":"Social Share Buttons WordPress plugin: stored XSS via share_url parameter","impact":"medium","summary":"The Social Share Buttons plugin for WordPress up to and including 1.30 does not sanitize or escape the 'form (containing share_url)' parameter. An authenticated subscriber can store a script that runs in the browser of any visitor to the affected page.","category":"package","nicknames":[],"who_cares":["wordpress","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Attacker runs scripts in visitors' browsers on the site","analyst_note":"","how_to_check":"- Check the installed version of the Social Share Buttons plugin in the WordPress admin plugin list or `wp plugin get <plugin-slug> --field=version`\n- Confirm whether subscriber-level accounts can register on the site","needs_analyst":false,"not_affected_if":["plugin-not-installed","auth-required"],"who_is_affected":"Sites running the Social Share Buttons plugin at version `1.30` or older where subscribers or higher can log in. The sources say exploitation also depends on the plugin's review-nag timer having elapsed, so an attacker must wait for it. Sites without this plugin, or running a newer version, are not affected.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000625,"input_tokens":3442,"output_tokens":562,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-100108':14A,17A '-2026':13A,16A '1.30':34B,94C '7':138C 'access':114C,130C 'admin':153C 'affect':63B 'arbitrari':119C 'attack':109C,148C 'authent':47B,108C 'browser':57B 'button':3A,26B,68C 'contain':42B,83C 'cross':77C 'cross-sit':76C 'cve':12A,15A 'day':139C 'dom':171C 'due':95C 'elaps':145C 'escap':39B,102C 'execut':126C 'exploit':134C 'first':150C 'form':41B,82C 'handler':165C 'host':21B 'includ':33B,93C 'inject':118C,132C 'input':98C 'insuffici':97C 'level':113C 'make':104C 'nag':142C 'need':158C 'network':164C 'nonc':157C 'output':101C 'packag':18B 'page':64B,123C,133C 'paramet':11A,45B,86C 'pass':176C 'plugin':5A,27B,69C 'possibl':106C 'reach':160C 'render':168C 'requir':135C 'review':141C 'review-nag':140C 'run':54B 'sanit':37B,99C 'save':163C 'save-network':162C 'script':52B,79C,121C 'self':20B 'self-host':19B 'share':2A,9A,25B,43B,67C,84C 'sinc':146C 'site':78C 'social':1A,24B,66C 'store':6A,50B,75C 'subscrib':48B,112C 'subscriber-level':111C 'timer':143C,174C 'url':10A,44B,85C 'user':129C 'version':89C 'via':8A,80C 'visit':154C 'visitor':60B 'vulner':73C 'web':120C 'whenev':127C 'wordpress':4A,22B,29B,71C 'wp':152C 'wp-admin':151C 'xss':7A","nicknames":[],"mitigations":[],"who_affected":"Sites running the Social Share Buttons plugin at version `1.30` or older where subscribers or higher can log in. The sources say exploitation also depends on the plugin's review-nag timer having elapsed, so an attacker must wait for it. Sites without this plugin, or running a newer version, are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T08:17:12+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-100108","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100108","severity":null,"published_at":"2026-10-16T08:17:12+00:00","modified_at":"2026-10-16T15:16:57+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","fetched_at":"2026-10-23T22:28:55+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"}