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fix: narrow pinterest bot-detection entry to avoid blocking Pinterest's in-app browser #4636

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fix: narrow pinterest bot-detection entry to avoid blocking Pinterest's in-app browser #4636

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fix: narrow pinterest bot-detection entry to avoid blocking Pinterest…
yfwmaniish Aug 27, 2026
b42323b
chore: add changeset for pinterest bot-detection fix
yfwmaniish Aug 27, 2026
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8 changes: 8 additions & 0 deletions .changeset/narrow-pinterest-bot.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
---
'@posthog/core': patch
'@posthog/browser-common': patch
'posthog-js': patch
'posthog-node': patch
---

Narrow the `pinterest` entry in the bot-detection blocklist to `pinterestbot`, so real users on Pinterest's in-app browser (whose UA also contains the substring `pinterest`) are no longer misclassified as bots and silently excluded from analytics. The crawler's other UA variant remains covered by the existing generic `bot.htm` entry, so no bot-detection coverage is lost.
5 changes: 5 additions & 0 deletions packages/browser/src/__tests__/utils.test.ts
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Expand Up @@ -174,6 +174,7 @@ describe('utils', () => {
'Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/)',
],
['BrightEdge Crawler/1.0 (crawler@brightedge.com)'],
['Mozilla/5.0 (compatible; Pinterestbot/1.0; +http://www.pinterest.com/bot.html)'],
])('blocks based on user agent', (botString) => {
expect(isBlockedUA(botString, [])).toBe(true)
expect(isBlockedUA(botString.toLowerCase(), [])).toBe(true)
Expand All @@ -194,6 +195,10 @@ describe('utils', () => {
[
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) elec/1.0.0 Chrome/126.0.6478.127 Electron/31.2.1 Safari/537.36',
],
[
// Pinterest app's own in-app browser -- a real user, not the Pinterestbot crawler
'Mozilla/5.0 (iPad; CPU OS 11_2_6 like Mac OS X) AppleWebKit/604.5.6 (KHTML, like Gecko) Mobile/15D100 [Pinterest/iOS]',
],
])('does not block based on non-bot user agent', (userAgent) => {
expect(isBlockedUA(userAgent, [])).toBe(false)
expect(isBlockedUA(userAgent.toLowerCase(), [])).toBe(false)
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6 changes: 5 additions & 1 deletion packages/core/src/utils/bot-detection.ts
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Expand Up @@ -28,7 +28,11 @@ export const DEFAULT_BLOCKED_UA_STRS = [
'msnbot',
'nessus',
'petalbot',
'pinterest',
// not the bare 'pinterest' -- that also matches the Pinterest app's own in-app
// browser UA (e.g. "...Mobile/15D100 [Pinterest/iOS]"), which is a real user,
// not the crawler. The crawler's other UA variant ("...pinterest.com/bot.html")
// is still covered by the generic 'bot.htm' entry below.
'pinterestbot',
'prerender',
'rogerbot',
'screaming frog',
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